Here are some clarifications by Tommy Tallarico about the game music credits:

"We put Mark Miller's name on the credits because I was still working at Virgin when the game was being worked on (but was secrectly working on EWJ on the side). At the time we didn't want to upset anyone at Virgin so we put Mark's name (who is a great friend of mine... ToeJam & Earl baby!!) on the project. Mark actually did help to convert the Sega Genesis work I was doing to the SNES.

Because of the style of music, sounds, approach, samples, etc... everyone in the industry and press kinda knew it was me. So after I left Virgin and started my own company (Tommy Tallarico Studios, Inc.) people wanted to know the "real" story so I let everyone know it was actually me.

The other guys you mentioned (and who I give credit to) did the following...